[Python-Dev] getting merge rights back on github

Hi All,
It's been quite a long time since I last used my python commit rights,
and it appears they've evaporated in the move to GitHub.
I'd like to get back into helping out, particularly with unittest.mock
where I've recently started helping out as a maintainer over on
https://github.com/testing-cabal/mock.
Please let me know what I need to do,
Chris